. Echinoidea. Sea urchins. ECHINOIDEA. I. l8l esculentus var. tentdspiria (p. 162), and so it gets tlie uame of Echinus tenuispinus n. sp. It is, as seen by Norman, closely allied to csculcuhis, with which it agrees in the most important characters: primary tubercle onl\- on every other ambulacral plate, and spines on the biiccal piates; it is easily distinguished from the latter b}- having far fewer tubercles, among which the primary series are ver\- distinct, and by its white colonr — csculoitus seems always to keep the colonr in spirit. I am decidedh- of opinion that it mnst be regarded as
. Echinoidea. Sea urchins. ECHINOIDEA. I. l8l esculentus var. tentdspiria (p. 162), and so it gets tlie uame of Echinus tenuispinus n. sp. It is, as seen by Norman, closely allied to csculcuhis, with which it agrees in the most important characters: primary tubercle onl\- on every other ambulacral plate, and spines on the biiccal piates; it is easily distinguished from the latter b}- having far fewer tubercles, among which the primary series are ver\- distinct, and by its white colonr — csculoitus seems always to keep the colonr in spirit. I am decidedh- of opinion that it mnst be regarded as an independent species, not only as a variety of csculoitus. It differs cousiderably as to habitns from this species, among whose forms I know 110 specimens with which it ma\ be confonnded. What I, above (p. 162), have interpreted as var. tenuispinus., is a pecnliar form with short, fine .spines, but with the usnal colonr of the test (from the Faroe Islands); accordingly it is not identical with Norm an's var. tenuispinus. « Strongyloccntrotus, lividus (p. 165) is by S1 n i t e r (371) mentioned from Dogger Bank — it is .S7/'. drobacliicnsis. Finally I shall call attention to the faet that no single regular Echinid belongs to the large cold depth north of Iceland. The account of the geographical distribution must otherwise be put off until the whole Echinid-material has been Fig. 12. Echinus ienuispinus n. sp. Natural size. (From a photograph.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Mortensen, Th. (Theodor), 1868-1952. Copenhagen, Printed by Bianco Luno
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